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Re: [TowerTalk] Two signals on the same frequency?

Subject: Re: [TowerTalk] Two signals on the same frequency?
From: Jim Brown <>
Date: Sun, 14 Aug 2011 14:47:54 -0700
List-post: <">>
On 8/14/2011 2:23 PM, Jim Brown wrote:
> The short answer is that the
> signals from multiple antennas will ADD algebraically,

One VERY important point is that for the signals to ADD, they must be 
SYCHRONOUS -- that is, on precisely the same frequency, coming from the 
same oscillator.  In practical terms, this means a signal generated by a 
single transmitter, then fed to two power amps that feed different 
antennas. Or a single transmitter (with or without a single power amp), 
split between multiple antennas.

If the two signals were not synchronous (that is, from two independent 
transmitters) their phase relationships will be random, and addition and 
subtraction will be quite unstable and unpredictable.

73, Jim K9YC

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